package com.example.wangx.teachingassistantTeacher.ui;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.LoaderManager;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.Loader;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;

import com.example.wangx.teachingassistantTeacher.R;
import com.example.wangx.teachingassistantTeacher.bean.User;
import com.example.wangx.teachingassistantTeacher.util.ContextUtil;
import com.loopj.android.http.RequestParams;

import java.util.ArrayList;
import java.util.List;

import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.UpdateListener;

import static android.Manifest.permission.READ_CONTACTS;

public class LoginActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Object> {

    private User user;
    private int type = -1;

    ContextUtil app;
    /**
     * Id to identity READ_CONTACTS permission request.
     */
    private static final int REQUEST_READ_CONTACTS = 0;

    /**
     * A dummy authentication store containing known user names and passwords.
     * TODO: remove after connecting to a real authentication system.
     */
    private static final String[] DUMMY_CREDENTIALS = new String[]{
            "foo@example.com:hello", "bar@example.com:world"
    };
    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private UserLoginTask mAuthTask = null;

    // UI references.
    private AutoCompleteTextView mUsernameView;
    private EditText mPasswordView;
    private View mProgressView;
    private View mLoginFormView;
    private RadioButton radioButton_student;
    private RadioButton radioButton_teacher;

    private ProgressDialog progressDialog; // 进度条
    private RequestParams params = new RequestParams(); // 上传参数

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        // 初始化Bmob云
        Bmob.initialize(LoginActivity.this,"551cb1a09ea696a94f107d9c002b72f1");

        // 创建user对象
        user = new User();

        app = (ContextUtil) getApplication();

        // 界面组件
        mUsernameView = (AutoCompleteTextView) findViewById(R.id.username);
        populateAutoComplete();
        mPasswordView = (EditText) findViewById(R.id.password);
        radioButton_student = (RadioButton) findViewById(R.id.radioButton_student);
        radioButton_teacher = (RadioButton) findViewById(R.id.radioButton_teacher);

        // 为密码输入设置监听器
        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.login || id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });

        Button mUsernameSignInButton = (Button) findViewById(R.id.username_sign_in_button);
        mUsernameSignInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);

        // 进度条初始化
        progressDialog = new ProgressDialog(this);
        progressDialog.setCancelable(false);
    }

    private void populateAutoComplete() {
        if (!mayRequestContacts()) {
            return;
        }

        getLoaderManager().initLoader(0, null, this);
    }

    private boolean mayRequestContacts() {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            return true;
        }
        if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
            Snackbar.make(mUsernameView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)
                    .setAction(android.R.string.ok, new View.OnClickListener() {
                        @Override
                        @TargetApi(Build.VERSION_CODES.M)
                        public void onClick(View v) {
                            requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
                        }
                    });
        } else {
            requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
        }
        return false;
    }

    /**
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == REQUEST_READ_CONTACTS) {
            if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                populateAutoComplete();
            }
        }
    }


    /**
     * Attempts to sign in or register the account specified by the login form.
     * If there are form errors (invalid email, missing fields, etc.), the
     * errors are presented and no actual login attempt is made.
     */
    private void attemptLogin() {
        if (mAuthTask != null) {
            return;
        }

        // Reset errors.
        mUsernameView.setError(null);
        mPasswordView.setError(null);

        // Store values at the time of the login attempt.
        String username = mUsernameView.getText().toString();
        String password = mPasswordView.getText().toString();

        boolean cancel = false;
        View focusView = null;



        // Check for a valid password, if the user entered one.
        if (TextUtils.isEmpty(password) ) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }

        // Check for a valid username address.
        if (TextUtils.isEmpty(username)) {
            mUsernameView.setError(getString(R.string.error_field_required));
            focusView = mUsernameView;
            cancel = true;
        }
        /**else if (!isUsernameValid(username)) {
         mUsernameView.setError(getString(R.string.error_invalid_email));
         focusView = mUsernameView;
         cancel = true;
         }
         */
        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            showProgress(true);
            mAuthTask = new UserLoginTask(username, password);
            mAuthTask.execute((Void) null);
        }
    }

    private boolean isEmailValid(String email) {
        //TODO: Replace this with your own logic
        return email.contains("@");
    }

    private boolean isPasswordValid(String password) {
        //TODO: Replace this with your own logic
        return password.length() > 4;
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
        // for very easy animations. If available, use these APIs to fade-in
        // the progress spinner.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);

            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(
                    show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });

            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }


    @Override
    public Loader<Object> onCreateLoader(int id, Bundle args) {
        return null;
    }

    @Override
    public void onLoadFinished(Loader<Object> loader, Object data) {

    }

    @Override
    public void onLoaderReset(Loader<Object> loader) {

    }


    public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
        List<String> emails = new ArrayList<>();
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) {
            emails.add(cursor.getString(ProfileQuery.ADDRESS));
            cursor.moveToNext();
        }

        addEmailsToAutoComplete(emails);
    }



    private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
        //Create adapter to tell the AutoCompleteTextView what to show in its dropdown list.
        ArrayAdapter<String> adapter =
                new ArrayAdapter<>(LoginActivity.this,
                        android.R.layout.simple_dropdown_item_1line, emailAddressCollection);

        mUsernameView.setAdapter(adapter);
    }


    private interface ProfileQuery {
        String[] PROJECTION = {
                ContactsContract.CommonDataKinds.Email.ADDRESS,
                ContactsContract.CommonDataKinds.Email.IS_PRIMARY,
        };

        int ADDRESS = 0;
        int IS_PRIMARY = 1;
    }

    /**
     * Represents an asynchronous login/registration task used to authenticate
     * the user.
     */
    public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

        private static final String TAG = "qqq";
        private final String mUsername;
        private final String mPassword;

        UserLoginTask(String username, String password) {
            mUsername = username;
            mPassword = password;
            // 获取界面上的用户和密码
            user.userId = mUsername;
            user.password = mPassword;
        }

        /**
         * 登陆逻辑验证
         * @param params
         * @return
         */
        @Override
        protected Boolean doInBackground(Void... params) {
            // TODO: attempt authentication against a network service.
            BmobQuery<User> query = new BmobQuery<>();
            query.addWhereEqualTo("userId",user.userId);
            query.addWhereEqualTo("password",user.password);
            query.findObjects(LoginActivity.this, new FindListener<User>() {
                @Override
                public void onSuccess(List<User> list) {
                    if (list.size()>0){
                        user = list.get(0);
                        type = list.get(0).type;
                        if (1==type&&radioButton_teacher.isChecked()){
                            user.isLogin = true;
                            // 更新用户登陆信息
                            user.update(LoginActivity.this, list.get(0).getObjectId(), new UpdateListener() {
                                @Override
                                public void onSuccess() {
                                    app.setUser(user);
                                    finish();
                                    Intent intent=new Intent(LoginActivity.this,MainActivity.class);
                                    startActivity(intent);
                                }
                                @Override
                                public void onFailure(int i, String s) {
                                    mPasswordView.setError("连接错误，请稍后再试");
                                    mPasswordView.requestFocus();
                                }
                            });
                        }else if(2==type&&radioButton_student.isChecked()){
                            user.isLogin = true;
                            // 更新用户登陆信息
                            user.update(LoginActivity.this, list.get(0).getObjectId(), new UpdateListener() {
                                @Override
                                public void onSuccess() {
                                    app.setUser(user);
                                    finish();
                                    Intent intent=new Intent(LoginActivity.this,MainActivity.class);
                                    startActivity(intent);
                                }
                                @Override
                                public void onFailure(int i, String s) {
                                    mPasswordView.setError("连接错误，请稍后再试");
                                    mPasswordView.requestFocus();
                                }
                            });
                        }else {
                            mAuthTask = null;
                            showProgress(false);
                            mPasswordView.setError("账号或密码错误");
                            mPasswordView.requestFocus();
                        }
                    }else {
                        mAuthTask = null;
                        showProgress(false);
                        mPasswordView.setError("账号或密码错误");
                        mPasswordView.requestFocus();
                    }
                }
                @Override
                public void onError(int i, String s) {
                    Toast.makeText(LoginActivity.this,"Error:"+s,Toast.LENGTH_SHORT).show();
                }
            });
            return false;
        }
        /**
         * 登陆任务处理
         * @param success
         */
        @Override
        protected void onPostExecute(final Boolean success) {

        }

        @Override
        protected void onCancelled() {
            mAuthTask = null;
            showProgress(false);
        }
    }
}
